EP0301507A2 - Underpressure collection container - Google Patents

Underpressure collection container Download PDF

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Publication number
EP0301507A2
EP0301507A2 EP88112136A EP88112136A EP0301507A2 EP 0301507 A2 EP0301507 A2 EP 0301507A2 EP 88112136 A EP88112136 A EP 88112136A EP 88112136 A EP88112136 A EP 88112136A EP 0301507 A2 EP0301507 A2 EP 0301507A2
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EP
European Patent Office
Prior art keywords
measuring tube
display device
tube
liquid
pressure
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Granted
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EP88112136A
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German (de)
French (fr)
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EP0301507B1 (en
EP0301507A3 (en
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Medical Limited Omni
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Individual
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
    • G01L7/18—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements using liquid as the pressure-sensitive medium, e.g. liquid-column gauges
    • G01L7/182—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements using liquid as the pressure-sensitive medium, e.g. liquid-column gauges constructional details, e.g. mounting
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/71—Suction drainage systems
    • A61M1/74—Suction control
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/71—Suction drainage systems
    • A61M1/73—Suction drainage systems comprising sensors or indicators for physical values
    • A61M1/732—Visual indicating means for vacuum pressure

Definitions

  • the present invention relates to a display device for displaying a pressure present in a cavity, in particular for pressure measurements in medical facilities, such as vacuum suction devices for suctioning off body fluids, consisting of a transparent measuring tube with a tube channel, an open end to be connected to the cavity and a closed end, the tube channel being at least partially filled with a liquid and a gas, in particular air, being contained between the liquid and the closed end, so that the liquid moves within the measuring tube when the pressure changes within the cavity and the volume of the gas changes.
  • Such a display device is known from US Pat. No. 4,079,729.
  • a device for blood collection which has a vacuum collecting container with a closure cap. The cap is pierced by a cannula after the latter has been inserted into a vein to draw blood. Due to the vacuum present in the collection container, there is a even blood sampling.
  • the display device described above is arranged inside the container.
  • this known display device only offers a qualitative display, ie it only allows a statement as to whether there is negative pressure or not.
  • the measuring tube has two spaced-apart marking rings, between which the liquid column must be arranged if there is sufficient negative pressure. If, for example, a vacuum loss occurs due to a leak, the liquid migrates out of the area between the marking rings; the device should no longer be used in this case.
  • pressure indicators which are designed as bellows have mainly been used so far.
  • a pressure indicator is e.g. described in DE-GM 73 36 232.
  • this pressure indicator also only provides a qualitative display, since the pressure-deformation characteristic of a bellows construction is not linear.
  • such large individual differences occur in the manufacture of bellows that calibration of the measuring system is practically impossible.
  • the existing measuring section is too short to ensure reliable pressure measurement.
  • a mechanical display device which consists of a piston which is displaceably guided within a cylinder and which is intended to cooperate with a scale of the transparent cylinder.
  • high friction occurs due to the required seal between the piston and the cylinder wall, so that the display is very imprecise due to hysteresis.
  • the object of the present invention is, based on the display device described in the introduction, to improve it in such a way that it ensures a very precise quantitative pressure display, but is also suitable for single-use products due to its low cost.
  • the tube channel has a cross section which changes from the open end of the measuring tube in the direction of the closed end.
  • the tube channel of the measuring tube tapers slightly conically from the open end towards the closed end. This advantageously results in a linear dependence of the display on the pressure, so that a likewise linear, easily readable scale can be used.
  • the measuring tube is closed to form the closed end by a closure cap, which has a depression with a defined volume following the tube channel of the measuring tube.
  • a closure cap which has a depression with a defined volume following the tube channel of the measuring tube.
  • a vacuum collecting container 1 is shown, as is usually used for wound drainage.
  • the collecting container 1 already has a negative pressure of approximately 1/10 of the atmospheric pressure in the state of delivery.
  • the container 1 has a connecting piece 2 for the pressure-tight insertion of a drainage hose 3, the other end, not shown, of e.g. is inserted into a patient's wound cavity.
  • the negative pressure present in the container 1 causes a rapid and steady discharge of secretions, which leads to an acceleration of the healing process /
  • the collecting container 1 has a further connecting piece 5, into which the display device 6 according to the invention can be inserted in a sealing manner.
  • the display device 6 consists of a measuring tube 7 made of a highly transparent material and has a pipe channel 9, a closed end 11 and an open end 12 to be connected to the interior of the collecting container 1, ie to the vacuum present here.
  • the pipe channel 9 is a preferably colored barrier liquid 13 and between the liquid 13 and the closed end 11 contain a gas, in particular air.
  • the liquid 13 moves in the event of changes in pressure within the container 1 with a change in the volume of the gas inside the tube channel 9 of the measuring tube 7.
  • FIG. 2 The state in which the gas between the closed end 11 due to the negative pressure prevailing in the collecting container 1 is shown in FIG and the liquid 13 has expanded so that the liquid 13 has moved in the direction of the container interior to indicate the negative pressure (here 0.1 bar) in the pipe channel 9.
  • the open end 12 is connected to normal pressure.
  • the measuring tube 7 is closed to form the closed end 11 by a closure cap 15, which has a depression 16 with a defined volume following the pipe channel 9 of the measuring tube 7.
  • the closure cap 15 in the state shown in Fig. 2, in which the open end 12 is connected to atmospheric pressure and the liquid 13 closes exactly at the end of the tube 7, is preferably from the side, i.e. from a direction approximately perpendicular to the longitudinal axis 17 of the tube, in order to enclose air or gas exclusively with the volume determined by the recess 16. Due to the defined air or gas volume, a scale 18, e.g. shown in Fig. 1, determined and attached to the measuring tube 7.
  • the closure cap 15 (FIG. 3) has a flat depression 19 which surrounds the opening side of the depression 16 and whose surface shape corresponds to the front end face of the measuring tube 7. In the area of this recess 19 the measuring tube 7 is integrally connected to the cap 15, for example glued or welded.
  • the pipe channel 9 tapers slightly conically from the open end 12 of the measuring tube 7 in the direction of the closure cap 15.
  • the inner wall 21 of the measuring tube 7 with its tube longitudinal axis 17 includes an angle ⁇ of 15 'to 60', preferably about 30 '(0.5 °) (0.25 ° ⁇ ⁇ ⁇ 1 °). Due to this design, the pressure scale 18 can be made approximately linear.
  • other cross-sectional changes of the pipe duct 7, which have the same effect in the sense of the invention, are also possible in addition to the conicity described.
  • a hydrophobic filter 22 (FIG. 1) can be arranged at the open end 12 of the measuring tube 7.
  • This filter 22 is made of a material that is impermeable to liquids, but permeable to gases.
  • the measuring tube 7 has a preferably cylindrical plug-in area 23 adjoining the open end 12 for plugging into the connecting piece 5 of the collecting container 1. Following the plug-in area 23, the measuring tube 7 has on its outer wall an annular web 24 which forms a plug-in limiting stop which interacts with the connecting piece 5.
  • the liquid 13 can e.g. consist of n-decane, glycerin, n-octane or xylene, or a mixture of these substances.
  • the measuring tube 7 consists, at least in the area of the scale, of a highly transparent material, such as e.g. HDPE, PUR, PA or PEBA.
  • a highly transparent material such as e.g. HDPE, PUR, PA or PEBA.
  • the scale 18 is clearly visible on the measuring tube 7, e.g. printed, embossed, glued or raised or recessed in the same material. It can be advantageous if the material of the measuring tube 7 itself or an additionally applied material ("Schellbach stripe") causes a magnifying or magnifying effect, which further increases the reading accuracy of the display device according to the invention.
  • the display device according to the invention works almost without hysteresis, so that in connection with the taper of the pipe channel and the defined gas volume between the Liquid and the closure cap according to the invention a very accurate, quantitative and position-independent pressure display, both for negative pressures of ⁇ 0.05 bar and for pressures of ⁇ 300 mm Hg is guaranteed.
  • the liquid acts as a barrier or seal for the pressure, so that a long use, e.g. of vacuum collecting containers can be guaranteed.
  • the display device according to the invention is particularly suitable for the following applications: Overpressure measurements: Arterial and venous pressure measurement CSF pressure measurement, Bubble pressure measurement, etc. Vacuum measurements: High and low pressure body drainage, in suction devices, in blood sampling devices, etc.

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  • Health & Medical Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Vascular Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)
  • Drying Of Solid Materials (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

The invention relates to an indicator device for indicating a pressure prevailing in a cavity, particularly for pressure measurements in medical apparatuses, such as vacuum suction arrangements for drying off body fluids, the device consisting of a small transparent tube with a tubular channel, an open end to be connected to the cavity, and a closed end. The tubular channel is filled at least partially with a fluid, and a gas, in particular air, is contained between the fluid and the closed end so that, in the event of changes in pressure inside the cavity, with a change in volume of the gas, the fluid moves inside the measurement tube. The tubular channel (9) has a cross-section which changes from the open end (12) of the measurement tube (7) in the direction of the closed end (11). <IMAGE>

Description

Die vorliegende Erfindung betrifft eine Anzeigevorrichtung zur Anzeige eines in einem Hohlraum vorhandenen Druckes, insbesondere für Druckmessungen in medizinischen Einrichtun­gen, wie Vakuum-Saugvorrichtungen zum Absaugen von Körper­flüssigkeiten, bestehend aus einem transparenten Meßröhrchen mit einem Rohrkanal, einem offenen, mit dem Hohlraum zu verbindenden Ende sowie einem geschlossenen Ende, wobei der Rohrkanal zumindest teilweise mit einer Flüssigkeit gefüllt ist und zwischen der Flüssigkeit und dem geschlossenen Ende ein Gas, insbesondere Luft, enthalten ist, so daß sich die Flüssigkeit bei Druckänderungen innerhalb des Hohlraumes unter Volumenänderung des Gases innerhalb des Meßröhrchens bewegt.The present invention relates to a display device for displaying a pressure present in a cavity, in particular for pressure measurements in medical facilities, such as vacuum suction devices for suctioning off body fluids, consisting of a transparent measuring tube with a tube channel, an open end to be connected to the cavity and a closed end, the tube channel being at least partially filled with a liquid and a gas, in particular air, being contained between the liquid and the closed end, so that the liquid moves within the measuring tube when the pressure changes within the cavity and the volume of the gas changes.

Eine derartige Anzeigevorrichtung ist aus der US-PS 4 079 729 bekannt. In dieser Druckschrift wird eine Vorrichtung zur Blutentnahme beschrieben, die einen Vakuum-Sammelbehäl­ter mit einer Verschlußkappe aufweist. Die Verschlußkappe wird durch eine Kanüle durchstochen, nachdem letztere zur Blutentnahme in eine Vene eingestochen wurde. Aufgrund des in dem Sammelbehälter vorhandenen Vakuums erfolgt eine gleichmäßige Blutentnahme. Um bereits vor der Anwendung der Blutentnahmevorrichtung dem Anwender Aufschluß darüber zu geben, ob noch ein zur Blutentnahme hinreichendes Vakuum in dem Sammelbehälter vorhanden ist, ist die oben beschriebene Anzeigevorrichtung innerhalb des Behälters angeordnet. Diese bekannte Anzeigevorrichtung bietet jedoch lediglich eine qualitative Anzeige, d.h. sie gestattet lediglich eine Aussage, ob Unterdruck vorhanden ist oder nicht. Das Meßröhrchen weist zwei voneinander beabstandete Markierungs­ringe auf, zwischen denen bei hinreichendem Unterdruck die Flüssigkeitssäule angeordnet sein muß. Tritt z.B. durch eine Undichtigkeit ein Vakuumverlust auf, so wandert die Flüssigkeit aus dem Bereich zwischen den Markierungringen heraus; die Vorrichtung soll in diesem Fall nicht mehr verwendet werden.Such a display device is known from US Pat. No. 4,079,729. In this document, a device for blood collection is described which has a vacuum collecting container with a closure cap. The cap is pierced by a cannula after the latter has been inserted into a vein to draw blood. Due to the vacuum present in the collection container, there is a even blood sampling. In order to provide the user with information as to whether there is still a sufficient vacuum in the collection container for blood collection before the blood collection device is used, the display device described above is arranged inside the container. However, this known display device only offers a qualitative display, ie it only allows a statement as to whether there is negative pressure or not. The measuring tube has two spaced-apart marking rings, between which the liquid column must be arranged if there is sufficient negative pressure. If, for example, a vacuum loss occurs due to a leak, the liquid migrates out of the area between the marking rings; the device should no longer be used in this case.

Bei Vakuum-Saugvorrichtungen zur Wunddrainage, mit denen über längere Zeit hinweg Körperflüssigkeiten, wie Wund­sekrete, aus Wundhöhlen abgesaugt werden sollen, ist jedoch eine möglichst genaue, quantitative Anzeige des restlichen Vakuums erwünscht. Derartige Saugvorrichtungen sollen zudem als Einmal-Produkt möglichst preiswert sein. Eine genaue Kalibrierung der aus der US-PS 4 079 729 bekannten Anzeige­vorrichtung ist jedoch schwierig, da bei der Herstellung der Vorrichtung, d.h. beim Einfüllen der Flüssigkeit in das einseitig geschlossene Röhrchen, das Volumen des zwischen der Flüssigkeit und dem geschlossenen Ende des Meßröhrchens angeordeten Gases nicht genau bemessen werden kann. Daher müßte jedes Meßröhrchen gesondert mittels einer Unterdruck­vorrichtung kalibriert werden, was sehr aufwendig und teuer wäre, so daß diese bekannte Anzeigevorrichtung zur Verwen­dung bei Einmal-Produkten ungeeignet ist. Zudem ist hier nachteiligerweise eine nicht-lineare Abhängigkeit der Anzeige vom Druck gewährleistet.In vacuum suction devices for wound drainage, with which body fluids, such as wound secretions, are to be sucked out of wound cavities over a long period of time, however, the most accurate, quantitative indication of the remaining vacuum is desirable. Such suction devices should also be as inexpensive as a single-use product. Accurate calibration of the display device known from US Pat. No. 4,079,729 is difficult, however, because during the manufacture of the device, ie when filling the liquid into the tube closed on one side, the volume of the gas arranged between the liquid and the closed end of the measuring tube cannot be measured precisely. Therefore, each measuring tube would have to be calibrated separately by means of a vacuum device, which would be very complex and expensive, so that this known display device is unsuitable for use with single-use products. In addition, a non-linear dependency is disadvantageous here Guaranteed display of pressure.

Für den beschriebenen Anwendungsfall für Saugvorrichtungen zur Wunddrainage wurden bisher hauptsächlich Druckanzeiger verwendet, die als Faltenbalg ausgeführt sind. Ein derarti­ger Druckanzeiger ist z.B. in dem DE-GM 73 36 232 beschrie­ben. Dieser Druckanzeiger schafft jedoch ebenfalls ledig­lich eine qualitative Anzeige, da die Druck-Deformations-­Kennlinie einer Faltenbalgkonstruktion nicht linear ver­läuft. Außerdam treten bei der Herstellung von Faltenbälgen derartig große individuelle Unterschiede auf, daß eine Kalibrierung des Meßsystems praktisch unmöglich ist. Abgesehen davon ist auch die vorhandene Meßstrecke zu gering, um eine sichere Druckmessung zu gewährleisten.For the described application for suction devices for wound drainage, pressure indicators which are designed as bellows have mainly been used so far. Such a pressure indicator is e.g. described in DE-GM 73 36 232. However, this pressure indicator also only provides a qualitative display, since the pressure-deformation characteristic of a bellows construction is not linear. In addition, such large individual differences occur in the manufacture of bellows that calibration of the measuring system is practically impossible. Apart from this, the existing measuring section is too short to ensure reliable pressure measurement.

Aus diesen Gründen ist auch die aus dem DE-GM 79 02 325 bekannte Kombination eines Faltenbalges mit einem Skalen­träger zur quantitativen Druckmessung ungeeignet.For these reasons, the combination of a bellows with a scale carrier known from DE-GM 79 02 325 is also unsuitable for quantitative pressure measurement.

Schließlich ist aus der EP 0061723 eine mechanische Anzeige­vorrichtung bekannt, die aus einem innerhalb eines Zylinders verschiebbar geführten Kolben besteht, der mit einer Skala des transparenten Zylinders zusammenwirken soll. Bei dieser Ausbildung treten aufgrund der erforderlichen Abdichtung zwischen dem Kolben und der Zylinderwandung hohe Reibungen auf, so daß die Anzeige aufgrund von Hysterese sehr ungenau ist.Finally, a mechanical display device is known from EP 0061723, which consists of a piston which is displaceably guided within a cylinder and which is intended to cooperate with a scale of the transparent cylinder. In this embodiment, high friction occurs due to the required seal between the piston and the cylinder wall, so that the display is very imprecise due to hysteresis.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ausgehend von der eingangs beschriebenen Anzeigevorrichtung diese derart zu verbessern, daß sie eine sehr genaue quantitative Druch-Anzeige gewährleistet, sich aber dennoch durch geringe Kosten auch für Einmal-Produkte eignet.The object of the present invention is, based on the display device described in the introduction, to improve it in such a way that it ensures a very precise quantitative pressure display, but is also suitable for single-use products due to its low cost.

Erfindungsgemäß wird dies dadurch erreicht, daß der Rohr­kanal einen sich von dem offenen Ende des Meßröhrchens in Richtung des geschlossenen Endes verändernden Querschnitt aufweist. Vorzugsweise verjüngt sich der Rohrkanal des Meßröhrchens von dem offenen Ende in Richtung des geschlos­senen Endes leicht konisch. Hierdurch wird vorteilhafter­weise eine lineare Abhängigkeit der Anzeige vom Druck erreicht, so daß eine ebenfalls lineare, gut ablesbare Skala verwendet werden kann.According to the invention, this is achieved in that the tube channel has a cross section which changes from the open end of the measuring tube in the direction of the closed end. Preferably, the tube channel of the measuring tube tapers slightly conically from the open end towards the closed end. This advantageously results in a linear dependence of the display on the pressure, so that a likewise linear, easily readable scale can be used.

In einer vorteilhaften Weiterbildung der Erfindung ist das Meßröhrchen zur Bildung des geschlossenen Endes durch eine Verschlußkappe verschlossen, die im Anschluß an den Rohr­kanal des Meßröhrchens eine Vertiefung mit einem definierten Volumen aufweist. Durch diese vorteilhafte Ausbildung ist es auf sehr einfache Weise möglich, zwischen der Flüssigkeit und dem geschlossenen Ende des Meßröhrchens stets das gleiche, definierte Gas- bzw. Luftvolumen einzubringen, indem nämlich die Verschlußkappe bei Normaldruck dann auf das Röhrchen aufgesetzt wird, wenn die Flüssigkeit genau mit dem Ende des Röhrchens abschließt. Aufgrund des konstanten Gasvolumens läßt sich einmal rechnerisch oder empirisch eine in einer Druckeinheit, z.B. bar, kalibrierte Skala ermit­teln, die dann auf allen herzustellenden Meßröhrchen ange­bracht wird. Hierdurch ist die erfindungsgemäße Anzeigevor­richtung sehr preiswert herzustellen und folglich auch für Einmal-Produkte geeignet.In an advantageous development of the invention, the measuring tube is closed to form the closed end by a closure cap, which has a depression with a defined volume following the tube channel of the measuring tube. This advantageous design makes it possible in a very simple manner to always introduce the same, defined gas or air volume between the liquid and the closed end of the measuring tube, namely by placing the closure cap on the tube at normal pressure when the liquid is accurate ends with the end of the tube. Due to the constant gas volume, one can be calculated or empirically used in a pressure unit, e.g. bar, determine calibrated scale, which is then attached to all measuring tubes to be manufactured. As a result, the display device according to the invention is very inexpensive to manufacture and consequently also suitable for single-use products.

Weitere vorteilhafte Ausgestaltungsmerkmale der Erfindung sind in den Unteransprüchen sowie der folgenden Beschreibung enthalten.Further advantageous design features of the invention are contained in the subclaims and the following description.

Anhand eines in der Zeichnung dargestellten Ausführungs- und Anwendungsbeispiels soll im folgenden die Erfindung näher erläutert werden. Dabei zeigen:

  • Fig. 1 einen Vakuum-Sammelbehälter mit einer erfindungs­gemäßen Anzeigevorrichtung,
  • Fig. 2 einen gegenüber Fig. 1 vergrößerten Längsschnitt durch die erfindungsgemäße Anzeigevorrichtung und
  • Fig. 3 einen gegenüber Fig. 2 vergrößerten Längsschnitt durch eine Verschlußkappe der erfindungsgemäßen Anzeigevorrichtung.
The invention will be explained in more detail below with reference to an exemplary embodiment and application example shown in the drawing. Show:
  • 1 shows a vacuum collecting container with a display device according to the invention,
  • Fig. 2 is an enlarged longitudinal section compared to FIG. 1 through the display device according to the invention and
  • Fig. 3 is an enlarged longitudinal section compared to FIG. 2 through a closure cap of the display device according to the invention.

In Fig. 1 ist ein Unterdruck-Sammelbehälter 1 dargestellt, wie er üblicherweise für die Wunddrainage verwendet wird. Der Sammelbehälter 1 weist bereits im Leiferzustand einen Unterdruck von etwa 1/10 des atmosphärischen Druckes auf. Der Behälter 1 weist einen Anschlußstutzen 2 zum druck­dichten Einstecken eines Drainageschlauches 3 auf, dessen anderes, nicht dargestelltes Ende z.B. in eine Wundhöhole des Patienten eingeführt wird. Der in dem Behälter 1 vorhandene Unterdruck bewirkt eine rasche und stetige Ableitung von Sekreten, was zu einer Beschleunigung des Heilprozesses führt/In Fig. 1, a vacuum collecting container 1 is shown, as is usually used for wound drainage. The collecting container 1 already has a negative pressure of approximately 1/10 of the atmospheric pressure in the state of delivery. The container 1 has a connecting piece 2 for the pressure-tight insertion of a drainage hose 3, the other end, not shown, of e.g. is inserted into a patient's wound cavity. The negative pressure present in the container 1 causes a rapid and steady discharge of secretions, which leads to an acceleration of the healing process /

Der Sammelbehälter 1 weist einen weiteren Anschlußstutzen 5 auf, in den die erfindungsgemäße Anzeigevorrichtung 6 dichtend einsteckbar ist. Die Anzeigevorrichtung 6 besteht aus einem Meßröhrchen 7 aus einem hochtransparenten Material und weist einen Rohrkanal 9, ein geschlossenes Ende 11 sowie ein offenes, mit dem Innenraum des Sammelbehälters 1, d.h. mit dem hier vorhandenen Vakuum, zu verbindendes Ende 12 auf. In dem Rohrkanal 9 ist eine vorzugsweise eingefärbte Sperrflüssigkeit 13 sowie zwischen der Flüssigkeit 13 und dem geschlossenen Ende 11 ein Gas, insbesondere Luft, enthalten. Hierdurch bewegt sich die Flüssigkeit 13 bei Druckänderungen innerhalb des Behälters 1 unter Volmen­änderung des Gases innerhalb des Rohrkanals 9 des Meß­röhrchens 7. In Fig. 1 ist der Zustand dargestellt, in dem durch den in dem Sammelbehälter 1 herrschende Unterdruck das Gas zwischen dem geschlossenen Ende 11 und der Flüssigkeit 13 expandiert ist, so daß sich die Flüssigkeit 13 zur Anzeige des Unterdruckes (hier 0,1 bar) in dem Rohrkanal 9 in Richtung des Behälterinnenraumes bewegt hat. Demgegen­über ist in Fig. 2 das offene Ende 12 mit Normaldruck verbunden.The collecting container 1 has a further connecting piece 5, into which the display device 6 according to the invention can be inserted in a sealing manner. The display device 6 consists of a measuring tube 7 made of a highly transparent material and has a pipe channel 9, a closed end 11 and an open end 12 to be connected to the interior of the collecting container 1, ie to the vacuum present here. In the pipe channel 9 is a preferably colored barrier liquid 13 and between the liquid 13 and the closed end 11 contain a gas, in particular air. As a result, the liquid 13 moves in the event of changes in pressure within the container 1 with a change in the volume of the gas inside the tube channel 9 of the measuring tube 7. The state in which the gas between the closed end 11 due to the negative pressure prevailing in the collecting container 1 is shown in FIG and the liquid 13 has expanded so that the liquid 13 has moved in the direction of the container interior to indicate the negative pressure (here 0.1 bar) in the pipe channel 9. In contrast, in FIG. 2 the open end 12 is connected to normal pressure.

Erfindungsgemäß ist das Meßröchen 7 zur Bildung des geschlossenen Endes 11 durch eine Verschlußkappe 15 verschlossen, die im Anschluß an den Rohrkanal 9 des Meß­röhrchens 7 eine Vertiefung 16 mit einem definierten Volumen aufweist. Die Verschlußkappe 15 wird in dem in Fig. 2 dargestellten Zustand, in dem das offene Ende 12 mit atmosphärischem Druck verbunden ist und die Flüssigkeit 13 genau mit dem Ende des Röhrchens 7 abschließt, vorzugsweise von der Seite her, d.h. aus einer zur Röhrchen-Längsachse 17 etwa senkrechten Richtung, aufgesetzt, um Luft bzw. Gas ausschließlich mit dem von der Vertiefung 16 bestimmten Volumen einzuschließen. Aufgrund des definierten Luft- bzw. Gasvolumens kann eine Skala 18, wie z.B. in Fig. 1 darge­stellt, ermittelt und auf dem Meßröhrchen 7 angebracht werden.According to the invention, the measuring tube 7 is closed to form the closed end 11 by a closure cap 15, which has a depression 16 with a defined volume following the pipe channel 9 of the measuring tube 7. The closure cap 15 in the state shown in Fig. 2, in which the open end 12 is connected to atmospheric pressure and the liquid 13 closes exactly at the end of the tube 7, is preferably from the side, i.e. from a direction approximately perpendicular to the longitudinal axis 17 of the tube, in order to enclose air or gas exclusively with the volume determined by the recess 16. Due to the defined air or gas volume, a scale 18, e.g. shown in Fig. 1, determined and attached to the measuring tube 7.

Die Verschlußkappe 15 (Fig. 3) weist eine die Öffnungsseite der Vertiefung 16 umgebende, in ihrer Flächenform der stirnseitigen Endfläche des Meßröhrchens 7 entsprechende, flache Vertiefung 19 auf. Im Bereich dieser Vertiefung 19 ist das Meßröhrchen 7 mit der Verschlußkappe 15 stoff­schlüssig verbunden, z.B. verklebt oder verschweißt.The closure cap 15 (FIG. 3) has a flat depression 19 which surrounds the opening side of the depression 16 and whose surface shape corresponds to the front end face of the measuring tube 7. In the area of this recess 19 the measuring tube 7 is integrally connected to the cap 15, for example glued or welded.

Weiterhin verjüngt sich erfindungsgemäß der Rohrkanal 9 von dem offenen Ende 12 des Meßröhrchens 7 in Richtung der Verschlußkappe 15 leicht konisch. Vorzugsweise schließt die Innenwandung 21 des Meßröhrchens 7 mit dere Röhrchen-­Längsachse 17 einen Winkel α von 15′ bis 60′, vorzugsweise ca. 30′ (0,5°) ein (0,25° ≦ α ≦ 1°). Aufgrund dieser Ausbildung läßt sich die Druck-Skala 18 annähernd linear gestalten. Dabei sind jedoch auch andere, im Sinne der Erfindung gleichwirkende Querschnittsveränderungen des Rohrkanals 7 neben der beschriebenen Konizität möglich.Furthermore, according to the invention, the pipe channel 9 tapers slightly conically from the open end 12 of the measuring tube 7 in the direction of the closure cap 15. Preferably, the inner wall 21 of the measuring tube 7 with its tube longitudinal axis 17 includes an angle α of 15 'to 60', preferably about 30 '(0.5 °) (0.25 ° ≦ α ≦ 1 °). Due to this design, the pressure scale 18 can be made approximately linear. However, other cross-sectional changes of the pipe duct 7, which have the same effect in the sense of the invention, are also possible in addition to the conicity described.

An dem offenen Ende 12 des Meßröhrchens 7 kann ein hydro­phober Filter 22 (Fig. 1) angeordnet sein. Dieser Filter 22 besteht aus einem Material, das für Flüssigkeiten undurch­lässig, für Gase jedoch durchlässig ist.A hydrophobic filter 22 (FIG. 1) can be arranged at the open end 12 of the measuring tube 7. This filter 22 is made of a material that is impermeable to liquids, but permeable to gases.

Das Meßröhrchen 7 weist einen sich an das offene Ende 12 anschließenden, vorzugsweise zylindrischen Steckbereich 23 zum Einstecken in den Anschlußstutzen 5 des Sammelbehälters 1 auf. Im Anschluß an den Steckbereich 23 weist das Meß­röhrchen 7 auf seiner Außenwandung einen Ringsteg 24 auf, der einem mit dem Anschlußstutzen 5 zusammenwirkenden Einsteck-Begrenzungsanschlag bildet.The measuring tube 7 has a preferably cylindrical plug-in area 23 adjoining the open end 12 for plugging into the connecting piece 5 of the collecting container 1. Following the plug-in area 23, the measuring tube 7 has on its outer wall an annular web 24 which forms a plug-in limiting stop which interacts with the connecting piece 5.

Die in dem Meßröhrchen 7 enthaltene Flüssigkeit ist vorzugs­weise mit einem Farbstoff, wie Methylenblau B, Patentblau, Kristallviolett, Remazol-Türkisblau B (Firma Hoechst), eingefäbrt und somit gut sichtbar. Dabei weist die Flüssig­keit 13 erfindungsgemäß folgende physikalische Eigenschaften auf:

  • a) niedriger Dampfdruck von ≧ 50° C bei 0,05 bar
  • b) niedrige Löslichkeit von Gasen von nahezu
    Figure imgb0001
  • c) hohe Oberflächenspannung von 10 bis 60 dyn/cm
  • d) Viskosität von 10 bis 500 cP.
The liquid contained in the measuring tube 7 is preferably colored with a dye, such as methylene blue B, patent blue, crystal violet, remazole turquoise blue B (Hoechst company) and is thus clearly visible. According to the invention, the liquid 13 has the following physical properties:
  • a) low vapor pressure of ≧ 50 ° C at 0.05 bar
  • b) low solubility of gases of almost
    Figure imgb0001
  • c) high surface tension of 10 to 60 dynes / cm
  • d) viscosity from 10 to 500 cP.

Die Flüssigkeit 13 kann z.B. aus n-Decan, Glyzerin, n-Octan oder Xylol, oder aber aus einem Gemisch dieser Stoffe, bestehen.The liquid 13 can e.g. consist of n-decane, glycerin, n-octane or xylene, or a mixture of these substances.

Das Meßröhrchen 7 besteht erfindungsgemäß zumindest im Bereich der Skala aus einem hochtransparenten Material, wie z.B. HDPE, PUR, PA oder PEBA. Bei Verwendung eines dieser Materialien treten vorteilhafterweise auch nach Einwirkung von Bestrahlungen, wie z.B. Gamma-Bestrahlung, keine Änderungen der physikalischen Eigenschaften und dere Transpa­renz auf.According to the invention, the measuring tube 7 consists, at least in the area of the scale, of a highly transparent material, such as e.g. HDPE, PUR, PA or PEBA. When using one of these materials, advantageously, even after exposure to radiation, e.g. Gamma radiation, no changes in physical properties and their transparency.

Die Skala 18 ist auf dem Meßröhrchen 7 gut sichtbar ange­bracht, z.B. aufgedruckt, eingeprägt, aufgeklebt oder materialeinheitlich erhaben oder vertieft ausgebildet. Dabei kann es vorteilhaft sein, wenn das Material des Meßröhrchens 7 selbst oder aber ein zusätzlich aufgebrachtes Material ("Schellbachstreifen") einen Vergrößerungs- bzw. Lupeneffekt bewirkt, was die Ablesegenauigkeit der erfin­dungsgemäßen Anzeigevorrichtung noch erhöht.The scale 18 is clearly visible on the measuring tube 7, e.g. printed, embossed, glued or raised or recessed in the same material. It can be advantageous if the material of the measuring tube 7 itself or an additionally applied material ("Schellbach stripe") causes a magnifying or magnifying effect, which further increases the reading accuracy of the display device according to the invention.

Die erfindungsgemäße Anzeigevorrichtung arbeitet nahezu ohne Hysterese, so daß in Verbindung mit der Konizität des Rohrkanals sowie dem definierten Gasvolumen zwischen der Flüssigkeit und der erfindungsgemäßen Verschlußkappe eine sehr genaue, quantitative sowie lageunabhängige Druckan­zeige, und zwar sowohl für Unterdrücke von ≦ 0,05 bar als auch für Überdrücke von ≧ 300 mm Hg gewährleistet ist.The display device according to the invention works almost without hysteresis, so that in connection with the taper of the pipe channel and the defined gas volume between the Liquid and the closure cap according to the invention a very accurate, quantitative and position-independent pressure display, both for negative pressures of ≦ 0.05 bar and for pressures of ≧ 300 mm Hg is guaranteed.

Dabei wirkt die Flüssigkeit als Sperre bzw. Dichtung für den Druck, so daß auch eine lange Verwendungsmöglichkeit z.B. von Unterdruck-Sammelbehältern garantiert werden kann.The liquid acts as a barrier or seal for the pressure, so that a long use, e.g. of vacuum collecting containers can be guaranteed.

Die erfindungsgemäße Anzeigevorrichtung eignet sich insbe­sondere für die folgenden Anwendungen:
Überdruckmessungen:
Arterielle und venöse Druckmessung
Liquordruckmessung,
Blasendruckmessung, usw.
Unterdruckmessungen:
Hoch- und Niederdruck-Körperdrainage,
in Absaug-Vorrichtungen,
in Vorrichtungen zur Blutentnahme usw.The display device according to the invention is particularly suitable for the following applications:
Overpressure measurements:
Arterial and venous pressure measurement
CSF pressure measurement,
Bubble pressure measurement, etc.
Vacuum measurements:
High and low pressure body drainage,
in suction devices,
in blood sampling devices, etc.

Claims (11)

1. Anzeigevorrichtung zur Anzeige eines in einem Hohlraum vorhandenen Druckes, insbesondere für Druckmessungen in medizinischen Einrichtungen, wie Vakuum-Saugvorrichtungen zum Absaugen von Körper­flüssigkeiten, bestehend ausd einem transparenten Meßröhrchen mit einem Rohrkanal, einem offenen, mit dem Hohlraum zu verbindenden Ende sowie einem geschlossenen Ende, wobei der Rohrkanal zumindest teilweise mit einer Flüssigkeit gefüllt ist, und zwischen der Flüssigkeit und dem geschlossenen Ende ein Gas, insbesondere Luft, enthalten ist, so däß sich die Flüssigkeit bei Druckänderungen innerhalb des Hohlraumes unter Volumenänderung des Gases innerhalb des Meßröhrchens bewegt,dadurch gekennzeichnet, daß der Rohrkanal (9) einen sich von dem offenen Ende (12) des Meßröhrchens (7) in Richtung des geschlossenen Endes (11) verän­dernden Querschnitt aufweist.1.Display device for displaying a pressure present in a cavity, in particular for pressure measurements in medical facilities, such as vacuum suction devices for suctioning off body fluids, consisting of a transparent measuring tube with a tube channel, an open end to be connected to the cavity and a closed end , wherein the tube channel is at least partially filled with a liquid, and a gas, in particular air, is contained between the liquid and the closed end, so that the liquid moves within the measuring tube when the pressure changes within the cavity and the volume of the gas changes, characterized in that the pipe duct (9) has a having from the open end (12) of the measuring tube (7) in the direction of the closed end (11) of varying cross section. 2. Anzeigevorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß sich der Rohrkanal (9) von dem offenen Ende (12) in Richtung des geschlossenen Endes (11) verjüngt, insbesondere leicht konisch verjüngt.2. Display device according to claim 1, characterized in that the pipe channel (9) tapers from the open end (12) in the direction of the closed end (11), in particular tapers slightly conically. 3. Anzeigevorrichtung nach Anspruch 1 oder 2, da­durch gekennzeichnet, daß die Innenwandung (21) des Meßröhrchens (7) mit der Röhrchen-Längsachse (17) einen Winkel (α) zwischen 15′und 60′, vorzugsweise etwa 30′, einschließt3. Display device according to claim 1 or 2, characterized in that the inner wall (21) of the measuring tube (7) with the tube longitudinal axis (17) includes an angle (α) between 15 'and 60', preferably about 30 ' 4. Anzeigevorrichtung nach einem oder mehreren der Ansprüche 1 bis 3, dadurch gekenn­zeichnet, daß das Meßröhrchen (7) zur Bildung des geschlossenen Endes (11) durch eine Verschluß­kappe (15) verschlossen ist, die im Anschluß an den Rohrkanal (9) des Meßröhrchens (7) eine Vertiefung (16) mit einem definierten Volumen aufweist.4. Display device according to one or more of claims 1 to 3, characterized in that the measuring tube (7) for forming the closed end (11) is closed by a closure cap (15) which is connected to the pipe channel (9) of the measuring tube (7) has a depression (16) with a defined volume. 5. Anzeigevorrichtung nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekenn­zeichnet, daß an dem offenen Ende (12) des Meßröhrchens (7) ein hydrophober Filter (22) angeord­net ist, der aus einem flüssigkeitsundurchlässigen und gasdurchlässigen Material besteht.5. Display device according to one or more of claims 1 to 4, characterized in that a hydrophobic filter (22) is arranged at the open end (12) of the measuring tube (7), which consists of a liquid-impermeable and gas-permeable material. 6. Anzeigevorrichtung nach einem oder mehreren der Ansprüche 1 bis 5, dadurch gekenn­zeichnet, daß das Meßröhrchen (7) einen sich an das offene Ende (12) anschließenden, vorzugsweise zylindrischen Steckbereich (23) zum Einstecken in einen Anschlußstutzen (5) eines Drucksystems, z.B. eines Vakuum-Sammelbehälters (1), aufweist.6. Display device according to one or more of claims 1 to 5, characterized in that the measuring tube (7) adjoining the open end (12), preferably cylindrical plug-in area (23) for insertion into has a connecting piece (5) of a pressure system, for example a vacuum collecting container (1). 7. Anzeigevorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß das Meßröhrchen (7) im Anschluß an den Steckbereich (23) auf seiner Außenwandung einen Ringsteg (24) aufweist, der einen mit dem Anschlußstutzen (5) zusammenwirkenden Einsteck-Begrenzungsanschlag bildet.7. Display device according to claim 6, characterized in that the measuring tube (7) in connection to the plug-in area (23) on its outer wall has an annular web (24) which forms a plug-in limiting stop cooperating with the connecting piece (5). 8. Anzeigevorrichtung nach einem oder mehreren der Anspüche 4 bis 7, dadurch gekenn­zeichnet, daß die Verschlußkappe (15) eine die Öffnungsseite der Vertiefung (16) umgebende, in ihrer Flächenform der stirnseitigen Endfläche des Meßröhrchens (7) entsprechende, flache Vertiefung (19) aufweist, in deren Bereich das Meßröhrchen (7) mit der Verschlußkappe (15) vorzugsweise stoff­schlüssig verbunden ist.8. Display device according to one or more of claims 4 to 7, characterized in that the closure cap (15) surrounding the opening side of the recess (16), in its surface shape the flat end face (7) corresponding to the end face of the measuring tube (7) has, in the area of which the measuring tube (7) with the closure cap (15) is preferably integrally connected. 9. Anzeigevorrichtung nach einem oder mehreren der Ansprüche 1 bis 8, dadurch gekenn­zeichnet, daß das Meßröhrchen (7) zumindest im Bereich einer Skala (18) aus einem hochtransparen­ten, bestrahlungs-unempfindlichen Material, insbeson­dere aus HDPE, PUR, PA oder PEBA, besteht.9. Display device according to one or more of claims 1 to 8, characterized in that the measuring tube (7) at least in the region of a scale (18) consists of a highly transparent, radiation-insensitive material, in particular HDPE, PUR, PA or PEBA . 10. Anzeigevorrichtung nach einem oder mehreren der Ansprüche 1 bis 9, dadurch gekenn­zeichnet, daß das Meßröhrchen (7) im Bereich der Skala (18) eine optische Vergrößerungs- bzw. Lupen-Einrichtung aufweist.10. Display device according to one or more of claims 1 to 9, characterized in that the measuring tube (7) in the region of the scale (18) has an optical magnifying or magnifying device. 11. Anzeigevorrichtung nach einem oder mehreren der Ansprüche 1 bis 10, dadurch gekenn­zeichnet, daß die in dem Meßröhrchen (7) enthaltene Flüssigkeit (13) aus n-Decan, Glyzerin, n-­Octan und/oder Xylol besteht und vorzugsweise Farbstoffe enthält.11. Display device according to one or more of claims 1 to 10, characterized in that the liquid (13) contained in the measuring tube (7) consists of n-decane, glycerol, n-octane and / or xylene and preferably contains dyes.
EP88112136A 1987-07-29 1988-07-27 Underpressure collection container Expired - Lifetime EP0301507B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3725193 1987-07-29
DE19873725193 DE3725193A1 (en) 1987-07-29 1987-07-29 QUANTITATIVE PRESSURE DISPLAY DEVICE

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EP0301507A2 true EP0301507A2 (en) 1989-02-01
EP0301507A3 EP0301507A3 (en) 1990-05-23
EP0301507B1 EP0301507B1 (en) 1994-12-28

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AT (1) ATE116124T1 (en)
DE (2) DE3725193A1 (en)

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CN109681240A (en) * 2019-01-30 2019-04-26 中铁二院工程集团有限责任公司 Tunnel-liner water pressure monitoring system osmometer mounting device and installation method

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Publication number Priority date Publication date Assignee Title
DE3909627A1 (en) * 1989-03-23 1990-09-27 Medinorm Ag DISPLAY DEVICE FOR GAS PRESSURES

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US3224276A (en) * 1963-01-07 1965-12-21 Kuhlman Instr Company Pressure testing apparatus
DE1948521U (en) * 1966-08-30 1966-10-27 Manometerfabrik Ing Robert Fie MANOMETER.
US3730168A (en) * 1970-09-10 1973-05-01 Kendall & Co Manometer
FR2428823A1 (en) * 1978-06-16 1980-01-11 Windeck Claude Hydrostatic manometer probe for oil or petrol gauge - has non-conducting U=shaped tube with one arm having spaced electrodes and common electrode near base
DE8710428U1 (en) * 1987-07-29 1988-01-07 CYTOMED Medizintechnik GmbH, 8750 Aschaffenburg Quantitative pressure indicator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3224276A (en) * 1963-01-07 1965-12-21 Kuhlman Instr Company Pressure testing apparatus
DE1948521U (en) * 1966-08-30 1966-10-27 Manometerfabrik Ing Robert Fie MANOMETER.
US3730168A (en) * 1970-09-10 1973-05-01 Kendall & Co Manometer
FR2428823A1 (en) * 1978-06-16 1980-01-11 Windeck Claude Hydrostatic manometer probe for oil or petrol gauge - has non-conducting U=shaped tube with one arm having spaced electrodes and common electrode near base
DE8710428U1 (en) * 1987-07-29 1988-01-07 CYTOMED Medizintechnik GmbH, 8750 Aschaffenburg Quantitative pressure indicator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109681240A (en) * 2019-01-30 2019-04-26 中铁二院工程集团有限责任公司 Tunnel-liner water pressure monitoring system osmometer mounting device and installation method
CN109681240B (en) * 2019-01-30 2024-03-12 中铁二院工程集团有限责任公司 Device and method for installing osmometer of tunnel lining water pressure monitoring system

Also Published As

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DE3852585D1 (en) 1995-02-09
EP0301507B1 (en) 1994-12-28
DE3725193A1 (en) 1989-02-09
EP0301507A3 (en) 1990-05-23
ATE116124T1 (en) 1995-01-15

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